Stuck after hitting START

[Quax]

In MP, no matter which server or mission, my game stucks after START in the map. I can start my engine, i can even move the plane or tank, others are seeing me and I hear my engine. This need about 2 to 3 minutes until I get into the cockpit, sometimes it stucks forever. Flying duels is not possible like that. It is new to me since the last patch.